91902883021 has 2 divisors, whose sum is σ = 91902883022. Its totient is φ = 91902883020.

The previous prime is 91902882991. The next prime is 91902883063. The reversal of 91902883021 is 12038820919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78058772100 + 13844110921 = 279390^2 + 117661^2 .

It is a cyclic number.

It is not a de Polignac number, because 91902883021 - 2¹⁷ = 91902751949 is a prime.

It is a super-2 number, since 2×91902883021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91902883621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45951441510 + 45951441511.

It is an arithmetic number, because the mean of its divisors is an integer number (45951441511).

Almost surely, 2^91902883021 is an apocalyptic number.

It is an amenable number.

91902883021 is a deficient number, since it is larger than the sum of its proper divisors (1).

91902883021 is an equidigital number, since it uses as much as digits as its factorization.

91902883021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 43.

The spelling of 91902883021 in words is "ninety-one billion, nine hundred two million, eight hundred eighty-three thousand, twenty-one".